maccoemack



(No Model.) I I 2 Sheets-Sheet J MAGCORMAOK 8c H. L. VAN ZILEL.

DIGESTER FOR TREATING PAPER STOCK.

No. 464,199. Pateilted Dec. 1,1891;

F l m m-u I!- l \ili- Hi i 1 I P \MTNE555E pk/ENTE S gwy/of UNITEDSTATES,

PATENT OFFICE.

JOHN MAOCORMAOK AND HARRY L. VAN ZILE, on ALBANY, NEW YORK,

SAID JOHN MAOOORMACK ASSIGNOR TO WILLIAM w. MACOORMAOK,

OF SAME PLACE,

DIGES I'E R FOR TREATING PAPER-STOCK.

SPECIFICATION forming part of Letters Patent No. 464,199,- datedDecember 1, 1891.

Application filed January 20, 1891. Serial No- 3'78,4=5( (N model.)

T0 at whom it may concern:

Be it known that we, JOHN MAOOORMAOK and HARRY L. VAN ZILE, both of thecity of Albany, county of Albany, and State of New York, have jointlyinvented new and useful Improvements in Digesters for TreatingPaper-Stock, of which the followingis a specification.

Our invention relates to improvements upon digester apparatus fortreating paperstock, and more particularly to the construction andarrangement of an annular chamber at the waist of a digester, connectinginteriorly with the latter, and adapted to be heated thereat by steamthat is not in contact with the stock, the object and purpose of ourinvention being to provide a means to apply heat to the liquor at thewaist of the digester, so as to make better available for use suchcirculations of the liquor as take it from either the top and bottom ofthe digester to discharge it into the waist or draw it from the waist todischarge it into the top and bottom of the digester, or from the topand Waist to discharge it into thebottom,or from the bottom and waist todischarge it into the top of the digester, or from the bottom todischarge it into the waist and top of the digester.

Accompanying this specification to form a part of it there are twoplates of drawings containing two figures illustrating our invention,with the same designation of parts by letter-reference used in all ofthem.

Of the illustrations, Figure 1 is a central vertical section of adigester having an annular chamber at the waist containing ourimprovements, with the circulatingpipes, pump, and valves of theapparatus shown in side elevation,with apart of the top and adjacentside thereat also shown in elevation. Fig. 2 is a transverse sectiontaken on the line ac'm of Fig. 1;:and Fig. 3 shows a section takenthrough the digester on the line m x of Fig. 1, with the top of theannular chamber shown in plan.

The several parts of the apparatus thus illustrated are designated byletter-reference and the function of the parts is described as follows:

The letter D designates the digester, I its interior, T its top orhead,and B its bot-tom.

The letter d designates a perforated diaphragm arranged transverselywithin the digester near its top or head T.

M is a perforated tube-form man-hole passage that extends through theupper diaphragm cl, and 0 indicates the man-hole cap.

The letter t designates one of a series of trusses arranged between theupper diaphragm cl and the interior surface of the upper head or top T.

The letter R designates a ring encircling the digester near its top, andg guy-rods connecting with said ring, with the outer ends of the rodsbroken off, the function being to run to and connect with a support tokeep the (ligester in position.

The letter (Z designates the lower dia-' phragm, which is perforated andarranged within the digester interior on an incline and extendingdownwardly, so that one end thereof will be below the valve V. g

. The letters 25 designate one of a series of truss-supports arrangedbetween the bottom B and the lower diaphragm (1 all of which parts of adigester are shown and described in another application for LettersPatent made by the undersigned and filed in the United States PatentOffice December 14:, 1889, Serial No. 333,692, and is now pending.

The letter P designates a rotary pump for causing a circulation of theliquor within the digester and for supplying fresh liquor when desired.This pump has one main inlet-pipep having thereon valves o o o, andstock-supplying pipes p having a valve 11 pipe having a valve o pipe 19having a valve 12 and a pipe 10 This main inlet-pipe has a branch I),having a valve m, a branch 19 having a valve m and a branch 19 having avalve 170 The letter O designates the main dischargepipe of the pump,and this pipe is provided with a branch- 0 having a valve n, abranch 0having a valve 41 and another branch 0 having a valve M, and is alsoprovided with a valve n arranged between the branches 0 0 on the mainoutlet-pipe 0.

boiler.

The letter P designates a pipe. that at its lower end connects with thebranches ()3 and 0 said pipe P having a valve o and at its top connectswith the digester interior above the diaphragm d. v

The letter P designates a pipe that at its lower end connects with thebranches 1) and 0 and at its upper end with the pipe Piand the letter Pdesignates a pipe which at its upper end connects with the annularchamber A and at its lower end with the pipe P and having a valve 92'.

The letter P designates a steam-s11 pply pipe that connects with thesteam-chamber S by means of a branch 3 at its upper end, and thereat isprovided with valves 5 s and at its outer end connects with the pipe Pand at its lowerend this steam-pipe P is provided with a horizontalbranch 19 having a valve o which branch enters the digester below thelower diaphragm 61 This steam-pipe P is broken off at a from itsconnection with a (Not shown.) The arrangement of pipes and valves thusillustrated and described is for the purpose,in connection with the pumpP, for producing different circulations of the liquor from the annularchamber to the top or bottom of the digester, or the reverse, or fromthe top of the digester to the annular chamber, and are made the subjectof the other applicatidn for Letters Patent made by us and hereinbe'foredesignated and are disclaimed herein.

The annular chamber A is produced upon the exterior Wall 20 of thedigester and connects with the interior of the latter by apertures aarranged in the digester-wall.

The letter J designates a perforated screen that is arranged upon theinside of the digester-wall, so as to be over the openings a and thefunction of this screen is to strain the liquor as it passes from thedigester into the annular chamber A. The letters S designatesteam-chambers arranged at the top and bottom of said annular chamber A,and e e e steam-pipes connecting at the top and bottom with thesteam-chambers S and intermediately passing through the annular chamberA, so that when steam enters the steam-chambers S and theirconnecting-pipes e c 6 through the pipe P the liquor in the annularchamber is heated by such steam, and heat is also applied to thedigester at the waist by the use of steam other than the introduction ofthe latter within the digester. The letter i desisnates a drip-cock bywhich the steam condensing in the steam-chamber may be drawn off. Thisannular ehamberA is produced by the ring-form top h, made in segmentsthat are placed to abut radially at r on their side edges withtop platesr having a packing beneath them, which packing is not shown, said topplates r being made to overlap the radially-abutting edges of thesegments, and where thus overlapping the latter connected with thesegments by bolts The sides of the annular chamber, as indicated at M,are

secured to the under side of the top It by a ring of angle-iron 0",which is riveted to the under side of the subtending edge of the top hand to the upper end of the annularchamber sides, and the lower end ofthe annular-chamber sides is connected to the upper surface of thebottom 71 where subtending the sides by means ofa ring of angle-iron rthat is riveted to the lower end of the sides and to the upper surfaceof the bottom 71, where subtending the sides.

The letter R designates a ring of angleiron connecting with the undersurface of the inner edge of the top h and the digester side wall, andthe letter R designates another ring of angle-iron which connects withthe inner edge of the bottom ring 7L2 and with the digester-wall 10 Theletter F designates an annular plate that is arranged transversely toform with the top plate 71- the upper steam-chamber S and the letter Fdesignates another annular plate that is arranged transversely to formwith the bottom annular plate 77, -the lower steam-chamber S and theletter 6 designates pipes arranged to connect with the bottom ring F andwith the top ring F, so as to pass through the annular chamber A.

As thus made and arranged, an annular chamber is formed about the waistof a digester, and this chamber is adapted to con-- tain liquor, withmeans for it to pass from the chamber into the digester underpumppressure, or to be drawn from the digester into the annular chamberby the draft force of the pump, and in the use of either of these twocurrents of the liquor heat may be applied to the latter from steam notdischarged into the liquor to reduce its strength Baum. Anotheradvantage which this manner of construction of an annular chamber givesis that which comes from heating the digester at the waist, where thesteam-chambers S S are in contact with the digester above and below theannular chamber. WVhere an annular chamber is thus constructed by meansof circulating-pipes, heat may be applied to the liqnor and the latterdirected to act locally upon the stock where requiring further treatmentwithout overtreating portions already sufficiently treated.

Having thus described our invention, what we claim, and desire to secureby Letters Patent, is

1. In an apparatus for treating paper-stock, the combination, with acylindrical digester, of an annular chamber arranged to encircle thedigester at the waist thereof, apertures connecting the digesterinterior with said annular chamber, a screen arranged on the digesterinterior where opposite said apertures, and steam-pipes arranged withinsaid annularchamber, constructed and arranged to heat the contents ofsaid annular chamber, substantially in the manner as and for thepurposes set forth.

2. The combination, with a digester, of an IOU annular chamber arrangedat the waist of the Signed at Troy, New York, this 24th day of former tobe projected from the sides thereof November, 1890, and in the presenceof the and havingaconnection with the digester intwo witnesses Whosenames are hereto writterior through an intermediate screen, an anten.

5 uular steam-heating chamber at the top and JOHN MACCORMAOK. bottom ofthe annular chamber, and pipes passing through the latter, connectingwith HARRY VAN ZILE' said top and bottom steam-chambers, substan-Vitnesses: tially in the manner as and for the purposes CHARLES S.BRINTNALL, IO set forth. V. E. HAGAN.

